/Engine/Source/Runtime/Engine/Public/SkeletalRenderPublic.h
VertexFactoryUserData for storing on aFMeshBatch.
virtual const [FSkinBatchVertexFactoryUserData](API\Runtime\Engine\FSkinBatchVertexFactoryUserData) * GetVertexFactoryUserData ( const int32 LODIndex, int32 ChunkIdx, ESkinVertexFactoryMode VFMode ) const